Improvement in making emery-wheels



J. D. ALVORD. E BRI WHEEL.

No. 30,189. Patented Oct. 2, 1860.

; UNITED STATES PATENT OFFICE.

J D. ALVORD, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT m MAKING EME'RY-WH'EELS.

Specification forming part of Letters Patent No. 30,l89,date'd October 2, 1860.

Tea/ll whom it may concern.- I

Be it known thatI, J. D. ALVORD, of Bridge port, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Method of Making'Emery-Wheels and I I do hereby declare that the following is a full,

clear, and exact description of the same,'refe'rence being had to the accompanying draw:

ings, forming a part of this specificatiomin which Figure l representsafront elevation of my invention. Fig.2 is'j'a central section of the same. f I

Similar-letters of reference in both views indicate corresponding parts.

The usual method of constructing emery-i wheels has been .to' press or cast the plastic *mass of which the wheel is to be composed around a' central tube having a smooth surface, which serves to receive the arbor or mandrel upon which .t he -wheel is to rotate when in use. lh'e'c'ontraetion of the plastic mate rial by drying suchas' to hold or fasten the wheel upon the tube.

v As an additional means of securing the wheel to the tube it g has been customary to place disks of metal over the extremities-of the tube after the wheel has become dried, these disks constiftuting flanges bPtWQQlLWhlCh the wheel is pressed by screwing or-rivetmg the disks upon the tubes; but this mode of construction has proved defective, because the disks when applied after the wheel is dried cannot be made to hold the wheel with sufiicient firmness to prevent it from becoming loose from the tube and thus useless, and-if the wheels are used without the flanges theyare still more weak at their junction witl the. tube. Another serious disadvantage of thepresent method of manufacture is that the portion of the wheel next the tube is liable to. 'crack for want of lateral support when the ing, and so that'ithe wheel will by co1 1traction become firmly attached to the tube and flanges, all as hereinafter represented and described.

1 To enable those skilled in the art to make and use my improvement, I will proceed to describe its construction and operation, reference being had to the accompanying drawings, forming a part of this specification.

A represents the emery-wheel composed of ground emery intermingled with a solution of glue, gum, or other binding substance, in such proportions that when the mass solidifies by drying it will behardand stone-like, and thus suitable for grinding and polishing purposes. The mass of which the wheel is to be composed is while in a plastic condition placed in a mold of circular form and then pressed so as to be shaped into the intended wheel.

The tube 13, composed of brass or other metal, may be first placed in the mold with one of the flanges attached, and the material pressed or cast around it, the other flange being afterward placed upon the extremity of the tube and embedded into the soft material; or, what is precisely equivalent, the wheel may be first pressed into the required state, and while yet soft and green the tube. B may be forced through its center, and the two flanges placed upon the extremities of the tube and embedded in the plasticmaterial, so that the outer edges of the flanges will be flush wi'th the sides of the wheel, as shown in Fig. 2. The ends of the tube are now riveted over upon the flanges, and the operation is com- :plete. When the wheel has become thoroughly dry, it will be found to have shrunk ,or contracted with great force upon the tube and flanges without any cracking, owing to the lateral support given by the flanges to the central part of the wheel during the drying process.

By reference to. Fig. 2 it will be observed that the flanges are curved or corrugated in form. I prefer to fashion them in this manner instead of using straight-sided flanges,

because by such corrugation or curving the surface of metal is increased upon'whic-h the wheel may shrink, and thus greater strength of attachment between the Wheel, tube, and flanges is obtained.

Having thus described my invention, what I now claim as new; and desire-t0 secure by that the wheel will become firmly attached to Letters Patent, isthe tube and flanges, all as hereili represented The method herein described of making and described.

emery-wheels, and which consists in pressing or casting the wheel upon a. flanged tube, so ALVORD' that when the wheel contracts in drying the \Vitnesses: ee'ntml part thereof will have lateral support B. GIROUSEE,

and thus be prevented from cracking, and so M. M. LIVINGSTON. 

